/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.engine.settle;

import org.apache.iotdb.commons.concurrent.WrappedRunnable;
import org.apache.iotdb.commons.exception.IllegalPathException;
import org.apache.iotdb.db.engine.settle.SettleLog.SettleCheckStatus;
import org.apache.iotdb.db.engine.storagegroup.TsFileResource;
import org.apache.iotdb.db.exception.WriteProcessException;
import org.apache.iotdb.db.service.SettleService;
import org.apache.iotdb.db.tools.settle.TsFileAndModSettleTool;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class SettleTask extends WrappedRunnable {
    private static final Logger logger = LoggerFactory.getLogger(SettleTask.class);
    private final TsFileResource resourceToBeSettled;

    public SettleTask(TsFileResource resourceToBeSettled) {
        this.resourceToBeSettled = resourceToBeSettled;
    }

    @Override
    public void runMayThrow() {
        try {
            settleTsFile();
        } catch (Exception e) {
            logger.error(
                    "meet error when settling file:{}", resourceToBeSettled.getTsFile().getAbsolutePath(), e);
        }
    }

    public void settleTsFile() throws WriteProcessException {
        List<TsFileResource> settledResources = new ArrayList<>();
        if (!resourceToBeSettled.isClosed()) {
            logger.warn(
                    "The tsFile {} should be sealed when settling.",
                    resourceToBeSettled.getTsFile().getAbsolutePath());
            return;
        }
        TsFileAndModSettleTool tsFileAndModSettleTool = TsFileAndModSettleTool.getInstance();
        try {
            if (tsFileAndModSettleTool.isSettledFileGenerated(resourceToBeSettled)) {
                logger.info("find settled file for {}", resourceToBeSettled.getTsFile());
                settledResources = tsFileAndModSettleTool.findSettledFile(resourceToBeSettled);
            } else {
                logger.info("generate settled file for {}", resourceToBeSettled.getTsFile());
                // Write Settle Log, Status 1
                SettleLog.writeSettleLog(
                        resourceToBeSettled.getTsFile().getAbsolutePath()
                                + SettleLog.COMMA_SEPERATOR
                                + SettleCheckStatus.BEGIN_SETTLE_FILE);
                tsFileAndModSettleTool.settleOneTsFileAndMod(resourceToBeSettled, settledResources);
                // Write Settle Log, Status 2
                SettleLog.writeSettleLog(
                        resourceToBeSettled.getTsFile().getAbsolutePath()
                                + SettleLog.COMMA_SEPERATOR
                                + SettleCheckStatus.AFTER_SETTLE_FILE);
            }
        } catch (IllegalPathException
                | IOException
                | org.apache.iotdb.tsfile.exception.write.WriteProcessException e) {
            resourceToBeSettled.readUnlock();
            logger.error("Exception to parse the tsfile in settling", e);
            throw new WriteProcessException(
                    "Meet error when settling file: " + resourceToBeSettled.getTsFile().getAbsolutePath(), e);
        }
        resourceToBeSettled.getSettleTsFileCallBack().call(resourceToBeSettled, settledResources);

        // Write Settle Log, Status 3
        SettleLog.writeSettleLog(
                resourceToBeSettled.getTsFile().getAbsolutePath()
                        + SettleLog.COMMA_SEPERATOR
                        + SettleCheckStatus.SETTLE_SUCCESS);
        logger.info(
                "Settle completes, file path:{} , the remaining file to be settled num: {}",
                resourceToBeSettled.getTsFile().getAbsolutePath(),
                SettleService.getINSTANCE().getFilesToBeSettledCount().get());

        if (SettleService.getINSTANCE().getFilesToBeSettledCount().get() == 0) {
            SettleLog.closeLogWriter();
            SettleService.getINSTANCE().stop();
            logger.info("All files settled successfully! ");
        }
    }
}
